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Finding the Fourth Proportional to 1,398.67, 1,930.43 and 809.24

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Solution

The fourth proportional to 1,398.67, 1,930.43 and 809.24 is: 1,116.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.67 : 1,930.43 = 809.24 : x
  2. Step 2: Convert to fraction form
    1,398.67/1,930.43 = 809.24/x
  3. Step 3: Cross multiply
    1,398.67x = 1,930.43 × 809.24
  4. Step 4: Simplify right side
    1,398.67x = 1,562,184.40
  5. Step 5: Solve for x
    x = 1,562,184.40/1,398.67
  6. Step 6: Final answer
    x = 1,116.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.